That's one expensive tweet!

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Natalie McGarry made the apology after being threatened with legal action

A Scottish MP has apologised and will pay out £10,000 to charity after the threat of legal action by a man she called an "outed holocaust denier".

Natalie McGarry, a former SNP spokesperson who was later ejected from the party, made the offensive remark about Scotland in Union director Alastair Cameron.

She agreed to pin an apology to the top of her Twitter feed for two weeks, but only hours after posting it made her profile private - meaning only those who already follow her can see it.

Mr Cameron hit out at her, posting his own message on the social media site saying the point of an apology being pinned was so that "people can see it". He also confirmed his solicitor had contacted Mrs McGarry.

Dear @NatalieMcgarry, point of apology being pinned is so ppl can see it. Please sort, or regrettably there may be further from my solicitor

The MP since appears to have made her apology accessible to those who do not follow her accessible.

The statement reads:

"On 6th March I tweeted that the Scotland in Union was headed by an 'internet troll' and an 'outed holocaust denier'. I made a serious mistake and accept there is no truth to those statements and apologise unreservedly to Mr Cameron for any distress caused."

As part of the agreement for no legal action to be taken further, Mrs McGarry paid £10,000 to charities Combat Stress, Aegis Trust and pro-Union campaigner JK Rowling's Lumos.

Mr Cameron wrote in response to news that the MP had agreed to apologise that he was looking forward to "drawing a line under this unfortunate incident".

"I am pleased to accept this apology from Mrs McGarry and draw a line under this unfortunate incident," he said in a statement.

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Mr Cameron said he was 'delighted some good will come of this'

"The payment Mrs McGarry has agreed to make will go to three excellent charities which I have been involved with and I am delighted that some good will now come of this.

"Politics in Scotland invokes passion and strong opinion on all sides, particularly on social media. I hope this serves as a reminder to us all that we need decency and respect in our debate, whether we agree with people or not.

"I look forward to continue making the positive case for Scotland in the UK."